Quote:

An Edelbrock 1406 is NOT a spreadbore carb.
The only Edelbrock carbs that were spreadbores were the Edelbrock Quadrajets.
Some of the carter AVS and AFB carbs had larger secondaries than primaries, but they were all squarebore carbs. The only Carter carb that was a spreadbore was the Thermoquad, however they did build some Quadrajets for GM.

But your 1406 is a garden variety 625cfm AFB and needs an adapter to work on a spreadbore intake.

The Street Demons are the only carbs that fit on either type of base. And the 650 is supposed to be great right out of the box. That's what I'd suggest.

R.




This is the bottom of my 1406, isnt this a spread bore? Secondaries are larger than primaries